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Significant Restructuring Costs Change in Restructuring Reserve - 2017 Restructuring Plan (Details) - USD ($)
$ in Millions
 3 Months Ended 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Sep. 30, 2017
Sep. 30, 2016
Restructuring Cost and Reserve [Line Items]        
Restructuring and impairment costs $ 158 $ 78    
2016 Restructuring Plan [Domain]        
Restructuring Cost and Reserve [Line Items]        
Restructuring and impairment costs       $ 288
2017 Restructuring Plan        
Restructuring Cost and Reserve [Line Items]        
Restructuring and impairment costs     $ 367  
Payments for Restructuring (28)   (75)  
Restructuring Reserve, Settled without Cash     (78)  
Adjustment to restructuring reserves     25  
Restructuring Reserve 211   239  
Employee Severance | 2017 Restructuring Plan        
Restructuring Cost and Reserve [Line Items]        
Restructuring and impairment costs     276  
Payments for Restructuring (26)   (75)  
Restructuring Reserve, Settled without Cash     0  
Adjustment to restructuring reserves     25  
Restructuring Reserve 200   226  
Fixed Asset Impairment | 2017 Restructuring Plan        
Restructuring Cost and Reserve [Line Items]        
Restructuring and impairment costs     77  
Payments for Restructuring 0   0  
Restructuring Reserve, Settled without Cash     (77)  
Adjustment to restructuring reserves     0  
Restructuring Reserve 0   0  
Other Restructuring | 2017 Restructuring Plan        
Restructuring Cost and Reserve [Line Items]        
Restructuring and impairment costs     14  
Payments for Restructuring (2)   0  
Restructuring Reserve, Settled without Cash     (1)  
Adjustment to restructuring reserves     0  
Restructuring Reserve $ 11   13  
Corporate Segment | 2016 Restructuring Plan [Domain]        
Restructuring Cost and Reserve [Line Items]        
Restructuring and impairment costs       161
Corporate Segment | 2017 Restructuring Plan        
Restructuring Cost and Reserve [Line Items]        
Restructuring and impairment costs     166  
Building Technologies & Solutions EMEA LA [Member] | 2017 Restructuring Plan        
Restructuring Cost and Reserve [Line Items]        
Restructuring and impairment costs     74  
Building Solutions North America | 2017 Restructuring Plan        
Restructuring Cost and Reserve [Line Items]        
Restructuring and impairment costs     59  
Power Solutions | 2016 Restructuring Plan [Domain]        
Restructuring Cost and Reserve [Line Items]        
Restructuring and impairment costs       66
Power Solutions | 2017 Restructuring Plan        
Restructuring Cost and Reserve [Line Items]        
Restructuring and impairment costs     20  
Building Solutions Asia Pacific | 2017 Restructuring Plan        
Restructuring Cost and Reserve [Line Items]        
Restructuring and impairment costs     16  
Global Products | 2016 Restructuring Plan [Domain]        
Restructuring Cost and Reserve [Line Items]        
Restructuring and impairment costs       $ 44
Global Products | 2017 Restructuring Plan        
Restructuring Cost and Reserve [Line Items]        
Restructuring and impairment costs     $ 32